VectorData Extract ROI

Perform an extract ROI on the input vector data according to the input image extent

Detailed description

This application extracts the vector data features belonging to a region specified by the support image envelope. Any features intersecting the support region is copied to output. The output geometries are NOT cropped.

Parameters

This section describes in details the parameters available for this application. Table [1] presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is VectorDataExtractROI .

[1]Table: Parameters table for VectorData Extract ROI.
Parameter Key Parameter Type Parameter Description
io Group Group
io.vd Input vector data Input vector data
io.in Input image Input image
io.out Output vector data Output vector data
elev Group Group
elev.dem Directory Directory
elev.geoid Input File name Input File name
elev.default Float Float
inxml XML input parameters file XML input parameters file
outxml XML output parameters file XML output parameters file

[Input and output data]: Group containing input and output parameters.

  • Input Vector data: Input vector data.
  • Support image: Support image that specifies the extracted region.
  • Output Vector data: Output extracted vector data.

[Elevation management]: This group of parameters allows managing elevation values. Supported formats are SRTM, DTED or any geotiff. DownloadSRTMTiles application could be a useful tool to list/download tiles related to a product.

  • DEM directory: This parameter allows selecting a directory containing Digital Elevation Model files. Note that this directory should contain only DEM files. Unexpected behaviour might occurs if other images are found in this directory.
  • Geoid File: Use a geoid grid to get the height above the ellipsoid in case there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles. A version of the geoid can be found on the OTB website (http://hg.orfeo-toolbox.org/OTB-Data/raw-file/404aa6e4b3e0/Input/DEM/egm96.grd).
  • Default elevation: This parameter allows setting the default height above ellipsoid when there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles, and no geoid file has been set. This is also used by some application as an average elevation value.

Load otb application from xml file: Load otb application from xml file.

Save otb application to xml file: Save otb application to xml file.

Example

To run this example in command-line, use the following:

otbcli_VectorDataExtractROI -io.in qb_RoadExtract.tif -io.vd qb_RoadExtract_classification.shp -io.out apTvUtVectorDataExtractROIApplicationTest.shp

To run this example from Python, use the following code snippet:

#!/usr/bin/python

# Import the otb applications package
import otbApplication

# The following line creates an instance of the VectorDataExtractROI application
VectorDataExtractROI = otbApplication.Registry.CreateApplication("VectorDataExtractROI")

# The following lines set all the application parameters:
VectorDataExtractROI.SetParameterString("io.in", "qb_RoadExtract.tif")

VectorDataExtractROI.SetParameterString("io.vd", "qb_RoadExtract_classification.shp")

VectorDataExtractROI.SetParameterString("io.out", "apTvUtVectorDataExtractROIApplicationTest.shp")

# The following line execute the application
VectorDataExtractROI.ExecuteAndWriteOutput()

Limitations

None

Authors

This application has been written by OTB-Team.